if you log in to your ncs account there should be a checklist of what exactly to bring and how many but i guess you dont need it all so i suggest watching a youtube video, there are a few out there just type in “ncs item checklist” or “what to bring on ncs” or something like that
If you're doing outdoor activities for the 1st week bring with you tracksuit bottoms, a hoodie, waterproof jacket, walking boots/outdoor trainers, torch and clothes that you wouldn't mind getting dirty. Along with those bring the normal clothes that you wear.